canvas, body, html{
    margin: 0;
    padding: 0;
}
canvas{
    display: block;
}
#UIBox{
    width: 100%;
    text-align: center;
    position: fixed;
    z-index: 1000;
    bottom: 20px;
}
#UIBox button{
    font-size: 20px;
    padding: 20px;
    background: #a78001;
    color: white;
    border: 0;
    margin: 20px;
}